Grinding/Scraping noise on 1991 740 GL when going over bumps and accelerating

Discussion in 'Volvo 740' started by Interpage Network Services Inc., Sep 3, 2003.

  1. Hi,

    Over the past year or so, I've noticed that my 1991 740 GL (rear wheel
    drive) makes what can best be described as a "scraping" or grinding sound
    when it goes over moderate bumps in the road and when it accelerates from a
    stop.

    Essentially, it sounds and "feels" (vibration-wise) like metal scraping
    against concrete, and initially I thought it was the muffler or some other
    low-hanging part of the car in the rear hitting the road. This theory was
    re-enforced as the scraping/grinding noise was more frequent, occurred on
    smaller bumps and/or less dramatic starts from a complete stop (less
    acceleration) when the car was full with people or equipment as compared to
    when it was empty. (IE, the heavier the car, the more scraping, so it seemed
    likely that the added weight lowered the car and increased the likelihood
    and duration of the scraping/grinding noise.)

    However, when I took a look underneath, I didn't see anything which had
    scrape or other marks which would indicate that any part of the car was
    scraping against the road, which now leads me to be increasingly concerned
    that it may be something more complex and/or something related to the drive
    train.

    (BTW, I had the transmission replaced a few months ago and this problem
    pre-dated the replacement transmission, so I don't think that has anything
    (directly) to do with it.)

    When the car is just driving at speed, or on a very smooth road, the noise
    is not heard. The only time you hear the grinding/scraping noise is on a
    rough/bumpy road surface right after you go over a bump and/or when you make
    a quick start from a red light or a stop sign, etc. It may also be more
    prominent when accelerating uphill.

    Any ideas/pointers on what I should be looking at? (After replacing the
    transmission recently, I'm somewhat averse to another major investment in
    the car all too soon! :) )

    (I'm also considering getting a new S40 or a Jetta or Passat, but that's
    another thread :) I would, however, enjoy hearing
    thoughts/opinions/experiences with those cars...)

    Thanks in advance for any thoughts and help!

    Regards,

    -Doug
    Mail to: d<remove this>
    www.interpage.net
    (510) 315-2750
     
    Interpage Network Services Inc., Sep 3, 2003
    #1
    1. Advertisements

  2. Interpage Network Services Inc.

    ALRHALL Guest

    grinding sound
    A noise/vibration that increases with acceleration or heavier loading sounds
    like universal joint/center bearing trouble. However I have never heard it
    called a scraping noise.

    Al
     
    ALRHALL, Sep 4, 2003
    #2
    1. Advertisements

  3. Interpage Network Services Inc.

    Peter Milnes Guest

    It is obvious that something is touching what it shouldn't. Check if exhaust
    system is hanging correctly or contacting the underside of the car or the
    suspension. Can also be caused by weakening springs/shock absorbers.

    Cheers, Peter.

    : >grinding sound
    : >when it goes over moderate bumps in the road and when it accelerates from a
    : >stop.
    : >IE, the heavier the car, the more scraping,
    :
    : A noise/vibration that increases with acceleration or heavier loading sounds
    : like universal joint/center bearing trouble. However I have never heard it
    : called a scraping noise.
    :
    : Al
    :
    :
    :
    :
    :
    :
    :
     
    Peter Milnes, Sep 5, 2003
    #3
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.